1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include <sys/types.h>
#include <sys/stat.h>
#include <my_dir.h>
#include "transparent_file.h"
#define DEFAULT_CHAIN_LENGTH 512
/*
Version for file format.
1 - Initial Version. That is, the version when the metafile was introduced.
*/
#define TINA_VERSION 1
typedef struct st_tina_share {
char *table_name;
char data_file_name[FN_REFLEN];
uint table_name_length, use_count;
/*
Below flag is needed to make log tables work with concurrent insert.
For more details see comment to ha_tina::update_status.
*/
my_bool is_log_table;
/*
Here we save the length of the file for readers. This is updated by
inserts, updates and deletes. The var is initialized along with the
share initialization.
*/
my_off_t saved_data_file_length;
mysql_mutex_t mutex;
THR_LOCK lock;
bool update_file_opened;
bool tina_write_opened;
File meta_file; /* Meta file we use */
File tina_write_filedes; /* File handler for readers */
bool crashed; /* Meta file is crashed */
ha_rows rows_recorded; /* Number of rows in tables */
uint data_file_version; /* Version of the data file used */
} TINA_SHARE;
struct tina_set {
my_off_t begin;
my_off_t end;
};
class ha_tina: public handler
{
THR_LOCK_DATA lock; /* MySQL lock */
TINA_SHARE *share; /* Shared lock info */
my_off_t current_position; /* Current position in the file during a file scan */
my_off_t next_position; /* Next position in the file scan */
my_off_t local_saved_data_file_length; /* save position for reads */
my_off_t temp_file_length;
uchar byte_buffer[IO_SIZE];
Transparent_file *file_buff;
File data_file; /* File handler for readers */
File update_temp_file;
String buffer;
/*
The chain contains "holes" in the file, occured because of
deletes/updates. It is used in rnd_end() to get rid of them
in the end of the query.
*/
tina_set chain_buffer[DEFAULT_CHAIN_LENGTH];
tina_set *chain;
tina_set *chain_ptr;
uchar chain_alloced;
uint32 chain_size;
uint local_data_file_version; /* Saved version of the data file used */
bool records_is_known, found_end_of_file;
MEM_ROOT blobroot;
private:
int curr_lock_type;
bool get_write_pos(my_off_t *end_pos, tina_set *closest_hole);
int open_update_temp_file_if_needed();
int init_tina_writer();
int init_data_file();
public:
ha_tina(handlerton *hton, TABLE_SHARE *table_arg);
~ha_tina()
{
if (chain_alloced)
my_free(chain);
if (file_buff)
delete file_buff;
free_root(&blobroot, MYF(0));
}
const char *index_type(uint inx) { return "NONE"; }
const char **bas_ext() const;
ulonglong table_flags() const
{
return (HA_NO_TRANSACTIONS | HA_REC_NOT_IN_SEQ | HA_NO_AUTO_INCREMENT |
HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE |
HA_CAN_REPAIR);
}
ulong index_flags(uint idx, uint part, bool all_parts) const
{
/*
We will never have indexes so this will never be called(AKA we return
zero)
*/
return 0;
}
uint max_record_length() const { return HA_MAX_REC_LENGTH; }
uint max_keys() const { return 0; }
uint max_key_parts() const { return 0; }
uint max_key_length() const { return 0; }
/*
Called in test_quick_select to determine if indexes should be used.
*/
virtual double scan_time() { return (double) (stats.records+stats.deleted) / 20.0+10; }
/* The next method will never be called */
virtual bool fast_key_read() { return 1;}
/*
TODO: return actual upper bound of number of records in the table.
(e.g. save number of records seen on full table scan and/or use file size
as upper bound)
*/
ha_rows estimate_rows_upper_bound() { return HA_POS_ERROR; }
int open(const char *name, int mode, uint open_options);
int close(void);
int write_row(uchar * buf);
int update_row(const uchar * old_data, uchar * new_data);
int delete_row(const uchar * buf);
int rnd_init(bool scan=1);
int rnd_next(uchar *buf);
int rnd_pos(uchar * buf, uchar *pos);
bool check_and_repair(THD *thd);
int check(THD* thd, HA_CHECK_OPT* check_opt);
bool is_crashed() const;
int rnd_end();
int repair(THD* thd, HA_CHECK_OPT* check_opt);
/* This is required for SQL layer to know that we support autorepair */
bool auto_repair(int error) const
{ return error == HA_ERR_CRASHED_ON_USAGE; }
bool auto_repair() const { return 1; }
void position(const uchar *record);
int info(uint);
int reset();
int extra(enum ha_extra_function operation);
int delete_all_rows(void);
int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
bool check_if_incompatible_data(HA_CREATE_INFO *info,
uint table_changes);
int external_lock(THD *thd, int lock_type);
THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
enum thr_lock_type lock_type);
/*
These functions used to get/update status of the handler.
Needed to enable concurrent inserts.
*/
void get_status();
void update_status();
/* The following methods were added just for TINA */
int encode_quote(uchar *buf);
int find_current_row(uchar *buf);
int chain_append();
};
|